Porter , J. Mark .
Phylogeny of Loeselia (Polemoniaceae): Diversification of a self-compatible lineage.
Loeselia L. is an obscure lineage in Polemoniaceae that incorporates a genus of approximately 17 species in two subgenera, Loeselia and Glumiselia. Loeselia ranges from Colombia and Venezuela to southern Arizona, U.S.A., but its greatest diversity is in MÃ©xico. It has played a central role in hypotheses concerning the origin and diversification of Polemoniaceae in the temperate New World. Grant (1959, 1998a, 1998b) has suggested that Loeselia, with its putatively ancestral features (woodiness, simple leaves, tropical distribution) represents the common ancestor of temperate genera such as Eriastrum Woot. & Standl., Gilia Ruiz & Pav., Ipomopsis Michx., Langloisia Greene, and Loeseliastrum (Benth.) Timbrook. Discussions concerning the phylogenetic relationships of Loeselia, as with those concerning the phylogeny of Polemoniaceae as a whole, reflects the tension between more traditional approaches to classification, (use of aclassifications for developing an understanding of phylogeny; see Grant 1998),and classification as an outcome of explicit phylogenetic hypothesis development, based on repeatable and philosophically justifiable methods such as parsimony, maximum likelihood or Bayesian analyses. Here I examine phylogenetic relationships of Loeselia, using chloroplast and nuclear DNA sequences, analyzed using maximum likelihood analysis and Bayesian inference. Phylogenetic inferences contradict both subgeneric classification and the reputed central role for Loeseliain the origin of Gilia and other genera. However, these inferences support two independent origins of hummingbird pollination in an otherwise self-compatible lineage.
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1 - Rancho Santa Ana Botanic Garden and Claremont Graduate University, Research: Program in Botany, 1500 N, College Ave., Claremont, CA, 91711, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Lindell B/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 3:30 PM